Example usage for org.apache.commons.discovery.tools DiscoverClass find

Introduction

In this page you can find the example usage for org.apache.commons.discovery.tools DiscoverClass find.

Prototype

public Class find(Class spiClass, String defaultImpl) throws DiscoveryException 

Source Link

Document

Find class implementing SPI.

Usage

From source file:org.apache.beehive.controls.api.bean.Controls.java

/**
 * Factory method for instantiating controls.
 *
 * @param beanClass the ControlBean class to instantiate
 * @param props an optional PropertyMap containing initial property values for the control.  
 * may be null.//from ww  w.  ja  va2  s .c  om
 * @param context the ControlBeanContext that will nest the created control.  If null, the 
 * thread-local context (possibly none) will be used.
 * @param id a unique ID for the created control.  If null, an ID will be auto-generated.
 * @return an instance of the specified ControlBean.
 */
public static <T extends ControlBean> T instantiate(Class<T> beanClass, PropertyMap props,
        ControlBeanContext context, String id) {
    try {
        DiscoverClass discoverer = new DiscoverClass();
        Class factoryClass = discoverer.find(ControlFactory.class, DEFAULT_FACTORY_CLASS);
        ControlFactory factory = (ControlFactory) factoryClass.newInstance();
        return factory.instantiate(beanClass, props, context, id);
    } catch (Exception e) {
        throw new ControlException("Exception creating ControlBean", e);
    }
}

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From source file:org.apache.beehive.controls.runtime.bean.ControlBean.java

/**
 * Internal method used to lookup a ControlBeanContextFactory.  This factory is used to create the
 * ControlBeanContext object for this ControlBean.  The factory is discoverable from either the containing
 * ControlBeanContext object or from the environment.  If the containing CBC object exposes a
 * contextual service of type {@link ControlBeanContextFactory}, the factory returned from this will
 * be used to create a ControlBeanContext object.
 *
 * @param context//from   www .j  a v a2 s. c  o m
 * @return the ControlBeanContextFactory discovered in the environment or a default one if no factory is configured
 */
private ControlBeanContextFactory lookupControlBeanContextFactory(
        org.apache.beehive.controls.api.context.ControlBeanContext context) {

    // first, try to find the CBCFactory from the container
    if (context != null) {
        ControlBeanContextFactory cbcFactory = context.getService(ControlBeanContextFactory.class, null);

        if (cbcFactory != null) {
            return cbcFactory;
        }
    }

    // Create the context that acts as the BeanContextProxy for this bean (the context that this bean _defines_).
    try {
        DiscoverClass discoverer = new DiscoverClass();
        Class factoryClass = discoverer.find(ControlBeanContextFactory.class,
                DefaultControlBeanContextFactory.class.getName());

        return (ControlBeanContextFactory) factoryClass.newInstance();
    } catch (Exception e) {
        throw new ControlException("Exception creating ControlBeanContext", e);
    }
}

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